:root {
      --color-primary: #2EC4B6;
      --color-primary-dark: #1d968b;
      --color-bg: #F7F9FC;
      --color-text: #1A202C;
      --color-text-muted: #4A5568;
      --color-text-light: #718096;
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body { font-family: "Inter", "Source Han Sans SC", sans-serif; background: var(--color-bg); color: var(--color-text); line-height: 1.8; }
    
    header { background: #fff; border-bottom: 1px solid #E2E8F0; padding: 0 40px; position: sticky; top: 0; z-index: 1000; }
    .nav-container { max-width: 1400px; margin: 0 auto; height: 75px; display: flex; align-items: center; justify-content: space-between; }
    .logo-area { display: flex; align-items: center; gap: 10px; text-decoration: none; color: inherit; }
    .logo-area img { width: 36px; height: 36px; border-radius: 8px; }
    .nav-links { display: flex; gap: 24px; }
    .nav-links a { text-decoration: none; color: var(--color-text-muted); font-weight: 500; font-size: 15px; transition: 0.2s; }
    .nav-links a.active, .nav-links a:hover { color: var(--color-primary); font-weight: 600; }
    
    .nav-download-btn { background: var(--color-primary); color: #fff; padding: 8px 24px; border-radius: 999px; text-decoration: none; font-size: 14px; font-weight: 700; transition: all 0.2s; display: flex; align-items: center; gap: 8px; border: none; cursor: pointer; }
    .nav-download-btn:hover { background: var(--color-primary-dark); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(46, 196, 182, 0.3); }
    .nav-download-btn svg { width: 16px; height: 16px; }
    .menu-toggle { display: none; background: none; border: none; color: var(--color-text); cursor: pointer; padding: 8px; margin-left: 10px; }

    main { max-width: 1400px; margin: 40px auto; padding: 0 40px; }
    
    .hero-section { background: var(--color-primary); color: #fff; border-radius: 24px; padding: 60px; display: flex; align-items: center; gap: 60px; position: relative; overflow: hidden; margin-bottom: 40px; }
    .hero-content { flex: 1; z-index: 1; }
    .hero-visual { width: 320px; flex-shrink: 0; z-index: 1; display: flex; flex-direction: column; align-items: center; gap: 20px; }
    .hero-buttons { width: 100%; display: flex; flex-direction: column; gap: 12px; }
    .btn-primary { background: #fff; color: var(--color-primary); padding: 14px 24px; border-radius: 12px; text-decoration: none; font-weight: 700; display: flex; align-items: center; justify-content: center; gap: 8px; box-shadow: 0 10px 20px rgba(0,0,0,0.1); font-size: 15px; transition: 0.2s; }
    .btn-primary:hover { transform: translateY(-2px); box-shadow: 0 15px 30px rgba(0,0,0,0.15); }
    .btn-secondary { background: #000; color: #fff; padding: 14px 24px; border-radius: 12px; text-decoration: none; font-weight: 700; display: flex; align-items: center; justify-content: center; gap: 8px; font-size: 15px; transition: 0.2s; border: 1px solid rgba(255,255,255,0.1); }
    .btn-secondary:hover { background: #333; }

    .portal-grid { display: grid; grid-template-columns: 1fr 340px; gap: 40px; }
    
    .section-box { background: #fff; border-radius: 16px; padding: 30px; margin-bottom: 30px; box-shadow: 0 4px 6px rgba(0,0,0,0.02); border: 1px solid #E2E8F0; }
    .section-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 24px; border-left: 4px solid var(--color-primary); padding-left: 12px; }
    .section-header h2 { font-size: 20px; font-weight: 800; color: #111; line-height: 1; }
    .more-link { font-size: 14px; color: var(--color-primary); text-decoration: none; font-weight: 500; }
    .more-link:hover { text-decoration: underline; }

    .article-item { display: flex; gap: 20px; padding: 20px 0; border-bottom: 1px solid #F1F5F9; text-decoration: none; color: inherit; transition: background 0.2s; }
    .article-item:last-child { border-bottom: none; padding-bottom: 0; }
    .article-item:hover { background: #F8FAFC; border-radius: 8px; padding: 20px; margin: 0 -20px; }
    .article-img { width: 140px; height: 90px; border-radius: 8px; overflow: hidden; flex-shrink: 0; background: #eee; }
    .article-info h3 { font-size: 16px; font-weight: 700; margin-bottom: 8px; transition: color 0.2s; }
    .article-item:hover .article-info h3 { color: var(--color-primary); }
    .article-info p { font-size: 13px; color: var(--color-text-muted); line-height: 1.6; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
    .article-meta { font-size: 12px; color: var(--color-text-light); margin-top: 10px; display: flex; gap: 15px; }
    
    .version-banner { background: var(--color-primary); color: #fff; padding: 30px; border-radius: 12px; margin-bottom: 30px; display: flex; align-items: center; gap: 30px; }
    .version-banner-title { flex-shrink: 0; border-right: 1px solid rgba(255,255,255,0.2); padding-right: 30px; }
    .version-banner-desc { font-size: 14px; line-height: 1.6; opacity: 0.9; }
    .version-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
    .version-card { border: 1px solid #E2E8F0; border-radius: 12px; padding: 20px; display: flex; flex-direction: column; gap: 15px; transition: all 0.2s; }
    .version-card:hover { border-color: var(--color-primary); box-shadow: 0 10px 20px rgba(46,196,182,0.05); transform: translateY(-2px); }
    .v-header { display: flex; align-items: center; gap: 15px; }
    .v-logo { width: 48px; height: 48px; border-radius: 10px; background: #f0f0f0; overflow: hidden; flex-shrink: 0; }
    .v-info { flex: 1; }
    .v-info h4 { font-size: 15px; font-weight: 700; margin-bottom: 4px; }
    .v-meta { font-size: 12px; color: var(--color-text-light); display: flex; gap: 10px; align-items: center; }
    .btn-v { padding: 6px 16px; font-size: 13px; font-weight: 600; color: var(--color-text-muted); background: #F1F5F9; border-radius: 6px; text-decoration: none; transition: 0.2s; white-space: nowrap; }
    .btn-v:hover { background: var(--color-primary); color: #fff; }
    .v-desc { font-size: 13px; color: var(--color-text-muted); line-height: 1.6; border-top: 1px dashed #E2E8F0; padding-top: 15px; }

    .faq-grid { display: grid; grid-template-columns: 1fr; gap: 15px; }
    .faq-item { padding: 20px; border: 1px solid #E2E8F0; border-radius: 8px; transition: 0.2s; }
    .faq-item:hover { border-color: var(--color-primary); background: #F8FAFC; }
    .faq-item h4 { font-size: 15px; margin-bottom: 8px; display: flex; align-items: center; gap: 8px; }
    .faq-item h4::before { content: 'Q'; color: var(--color-primary); font-weight: 800; font-size: 18px; }
    .faq-item p { font-size: 13px; color: var(--color-text-muted); padding-left: 20px; }

    .sidebar { position: sticky; top: 115px; height: fit-content; display: flex; flex-direction: column; gap: 20px; }
    .sidebar-box { background: #fff; border-radius: 16px; padding: 25px; box-shadow: 0 4px 6px rgba(0,0,0,0.02); border: 1px solid #E2E8F0; }
    .sidebar-box h3 { font-size: 16px; font-weight: 800; margin-bottom: 20px; padding-bottom: 12px; border-bottom: 1px solid #F1F5F9; }
    
    .hot-list { list-style: none; }
    .hot-list li { margin-bottom: 16px; display: flex; align-items: flex-start; gap: 12px; }
    .hot-rank { font-size: 14px; font-weight: 700; color: #fff; background: #CBD5E0; width: 20px; height: 20px; display: flex; align-items: center; justify-content: center; border-radius: 4px; flex-shrink: 0; }
    .hot-list li:nth-child(1) .hot-rank { background: #FF5A5F; }
    .hot-list li:nth-child(2) .hot-rank { background: #FF9F1C; }
    .hot-list li:nth-child(3) .hot-rank { background: #2EC4B6; }
    .hot-list a { color: var(--color-text); text-decoration: none; font-size: 14px; line-height: 1.4; transition: 0.2s; }
    .hot-list a:hover { color: var(--color-primary); }
    
    .download-card-mini { background: var(--color-primary); color: #fff; border-radius: 12px; padding: 20px; text-align: center; }
    .download-card-mini h4 { font-size: 16px; margin-bottom: 10px; }
    .mini-btn { background: #fff; color: var(--color-primary); border: none; padding: 10px; border-radius: 8px; font-weight: 700; font-size: 14px; display: block; margin-top: 15px; text-decoration: none; transition: 0.2s; cursor: pointer; }
    .mini-btn:hover { transform: translateY(-1px); box-shadow: 0 4px 12px rgba(0,0,0,0.1); }
    
    .footer { border-top: 1px solid #E2E8F0; background: #fff; padding: 50px 40px; margin-top: 60px; }
    .footer-content { max-width: 1400px; margin: 0 auto; display: flex; flex-wrap: wrap; gap: 40px; }
    .footer-column { flex: 1; min-width: 200px; }
    .footer-column h4 { margin-bottom: 16px; font-size: 16px; color: var(--color-text); }
    .footer-column ul { list-style: none; }
    .footer-column li { margin-bottom: 8px; }
    .footer-column a { text-decoration: none; color: var(--color-text-muted); font-size: 14px; }
    .footer-column a:hover { color: var(--color-primary); }
    
    .download-modal { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.6); display: none; align-items: center; justify-content: center; z-index: 2000; backdrop-filter: blur(5px); }
    .download-modal.active { display: flex; }
    .modal-card { background: #fff; padding: 40px; border-radius: 20px; width: 400px; text-align: center; box-shadow: 0 20px 40px rgba(0,0,0,0.2); }
    .progress-bar { height: 8px; background: #eee; border-radius: 4px; margin-top: 20px; overflow: hidden; }
    .progress-bar span { display: block; height: 100%; width: 0; background: var(--color-primary); transition: width 0.1s; }

    @media (max-width: 1024px) {
      .portal-grid { grid-template-columns: 1fr; }
      .sidebar { display: none; }
    }
    @media (max-width: 768px) { 
      .hero-section { flex-direction: column; padding: 30px; text-align: center; border-radius: 0; margin: -40px -20px 30px -20px; }
      .hero-visual { width: 100%; }
      main { padding: 0 20px; }
      .nav-links { display: none; }
      .nav-links.mobile-active { display: flex; flex-direction: column; position: absolute; top: 75px; left: 0; width: 100%; background: #fff; border-bottom: 1px solid #E2E8F0; padding: 20px 40px; gap: 15px; z-index: 1000; box-shadow: 0 10px 15px rgba(0,0,0,0.05); }
      .menu-toggle { display: block; }
      .nav-download-btn span { display: none; }
      .nav-download-btn { padding: 10px; }
      header { padding: 0 15px; }
      .version-grid { grid-template-columns: 1fr; }
      .version-banner { flex-direction: column; text-align: center; gap: 15px; padding: 20px; border-right: none; }
      .version-banner-title { border-right: none; padding-right: 0; border-bottom: 1px solid rgba(255,255,255,0.2); padding-bottom: 15px; }
      .article-meta { flex-direction: column; gap: 4px; }
    }